Servlet Filter test javaee-samples#84

Author: kubamarchwicki

servlet/servlet-filters/src/main/java/org/javaee7/servlet/filters/CharResponseWrapper.java

@@ -0,0 +1,23 @@
+package org.javaee7.servlet.filters;
+
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpServletResponseWrapper;
+import java.io.CharArrayWriter;
+import java.io.PrintWriter;
+
+public class CharResponseWrapper extends HttpServletResponseWrapper {
+    private CharArrayWriter output;
+
+    public String toString() {
+        return output.toString();
+    }
+
+    public CharResponseWrapper(HttpServletResponse response) {
+        super(response);
+        output = new CharArrayWriter();
+    }
+
+    public PrintWriter getWriter() {
+        return new PrintWriter(output);
+    }
+}

servlet/servlet-filters/src/main/java/org/javaee7/servlet/filters/FooBarFilter.java

@@ -0,0 +1,101 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
+ *
+ * The contents of this file are subject to the terms of either the GNU
+ * General Public License Version 2 only ("GPL") or the Common Development
+ * and Distribution License("CDDL") (collectively, the "License").  You
+ * may not use this file except in compliance with the License.  You can
+ * obtain a copy of the License at
+ * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
+ * or packager/legal/LICENSE.txt.  See the License for the specific
+ * language governing permissions and limitations under the License.
+ *
+ * When distributing the software, include this License Header Notice in each
+ * file and include the License file at packager/legal/LICENSE.txt.
+ *
+ * GPL Classpath Exception:
+ * Oracle designates this particular file as subject to the "Classpath"
+ * exception as provided by Oracle in the GPL Version 2 section of the License
+ * file that accompanied this code.
+ *
+ * Modifications:
+ * If applicable, add the following below the License Header, with the fields
+ * enclosed by brackets [] replaced by your own identifying information:
+ * "Portions Copyright [year] [name of copyright owner]"
+ *
+ * Contributor(s):
+ * If you wish your version of this file to be governed by only the CDDL or
+ * only the GPL Version 2, indicate your decision by adding "[Contributor]
+ * elects to include this software in this distribution under the [CDDL or GPL
+ * Version 2] license."  If you don't indicate a single choice of license, a
+ * recipient has the option to distribute your version of this file under
+ * either the CDDL, the GPL Version 2 or to extend the choice of license to
+ * its licensees as provided above.  However, if you add GPL Version 2 code
+ * and therefore, elected the GPL Version 2 license, then the option applies
+ * only if the new code is made subject to such option by the copyright
+ * holder.
+ */
+package org.javaee7.servlet.filters;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.annotation.WebFilter;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * @author Arun Gupta
+ */
+@WebFilter(filterName = "FooBarFilter", urlPatterns = {"/filtered/*"})
+public class FooBarFilter implements Filter {
+
+    private FilterConfig filterConfig;
+
+    private void doBeforeProcessing(ServletRequest request, ServletResponse response)
+            throws IOException, ServletException {
+        try (PrintWriter out = response.getWriter()) {
+            out.print("foo--");
+            out.flush();
+        }
+    }
+
+    private void doAfterProcessing(ServletRequest request, ServletResponse response)
+            throws IOException, ServletException {
+        try (PrintWriter out = response.getWriter()) {
+            out.print("--bar");
+            out.flush();
+        }
+    }
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response,
+            FilterChain chain)
+            throws IOException, ServletException {
+        PrintWriter out = response.getWriter();
+        CharResponseWrapper wrappedResponse = new CharResponseWrapper(
+                (HttpServletResponse)response);
+
+        doBeforeProcessing(request, wrappedResponse);
+        chain.doFilter(request, wrappedResponse);
+        doAfterProcessing(request, wrappedResponse);
+
+        out.write(wrappedResponse.toString());
+    }
+
+    @Override
+    public void destroy() {
+    }
+
+    @Override
+    public void init(FilterConfig filterConfig) {
+        this.filterConfig = filterConfig;
+    }
+
+}